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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548ae4a8d2ae7ae6553c43f8a6ee3da86286d809c21b460222d17857f37aa1ae' 
  AND token = 'WO4iNcE/P9euD6/dqyV/cv68qqMvLdptQcA26oyt5JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}